CN103620201B - The apparatus for diagnosing deterioration of exhaust sensor and deterioration diagnosis method - Google Patents
The apparatus for diagnosing deterioration of exhaust sensor and deterioration diagnosis method Download PDFInfo
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- CN103620201B CN103620201B CN201280031266.1A CN201280031266A CN103620201B CN 103620201 B CN103620201 B CN 103620201B CN 201280031266 A CN201280031266 A CN 201280031266A CN 103620201 B CN103620201 B CN 103620201B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Gas After Treatment (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The present invention is by the device of the deterioration diagnosis of downstream exhaust sensor (11).If conditions for diagnostics (S1) is set up, then suction air capacity (QM) is accumulated and conduct suction air capacity accumulated value (QMtotal), obtain and suck air capacity meansigma methods (QMav) and as suction air capacity (QM) average starting from diagnosis, set suction air capacity accumulation threshold (WKSTRG) (S3) based on this suction air capacity meansigma methods (QMav).If sucking air capacity accumulated value (QMtotal) to reach to suck air capacity accumulation threshold WKSTRG); then terminate to diagnose (S4); the output reversion times N of the downstream exhaust sensor (11) in during diagnosing compares (S5) with threshold value (Nmin), it is judged that be normal or deterioration (S6, S7).By utilizing suction air capacity meansigma methods (QMav) to set suction air capacity accumulation threshold (WKSTRG), thus get rid of by the impact caused by the flow velocity of catalyst-assembly (7) or the aerofluxus of downstream exhaust sensor (11).
Description
Technical field
The present invention relates to be arranged on the exhaust sensor in the exhaust channel of internal combustion engine, spy in order to detect exhaust gas composition
The deterioration of the downstream exhaust sensor not being provided in the downstream of catalyst-assembly carry out the apparatus for diagnosing deterioration that diagnoses and
Deterioration diagnosis method.
Background technology
Known a kind of air-fuel ratio control device, its in order to the air-fuel ratio of internal combustion engine is carried out feedback control and at internal combustion engine
Exhaust channel has exhaust sensor (so-called wide area type air-fuel ratio sensor or oxygen sensor), and known following knot
Structure, i.e. in order to improve the precision of air-fuel ration control, in the downstream of catalyst-assembly, also there is exhaust sensor.
This exhaust sensor, is likely to result in response and deteriorates, therefore work as premise due to deterioration or heat deterioration
Go out and have various apparatus for diagnosing deterioration, Patent Document 1 discloses returing cycle based on output signal and carry out deterioration diagnosis
Technology.Particularly, this returing cycle is i.e. sucked air capacity by the load of internal combustion engine to be affected, therefore, during the diagnosis of regulation
The suction air capacity of interior accumulation is the biggest, and deterioration judging threshold value is set to the least value, bad more than this at the returing cycle detected
When changing decision threshold, it is judged that deteriorate for exhaust sensor.
Above-mentioned apparatus for diagnosing deterioration of the prior art, is substantially based on following understanding: the output of exhaust sensor inverts
A certain amount of aerofluxus (accumulated value) is needed to flow through exhaust sensor, therefore, if sucking air capacity (flow of time per unit)
Relatively big, reach above-mentioned accumulated value the most corresponding thereto within a short period of time, thus by the deterioration judging relative to returing cycle
Threshold value is set to less value.Additionally, the technology of patent documentation 1 using the exhaust sensor of the upstream side of catalyst as object.
But, for being arranged in the diagnosis of the downstream exhaust sensor in the downstream of catalyst-assembly, exhaust sensor
The change of neighbouring exhaust gas composition is affected by the oxygen storage capacity of catalyst-assembly, and, because flowing through the aerofluxus of catalyst-assembly
Flow velocity, can capacity (accumulated value) needed for the output reversion of left and right exhaust sensor.That is, according to the present inventor's
New opinion, in the case of the exhaust sensor of downstream, if by the exhaust sensor in catalyst-assembly and downstream
The flow velocity of aerofluxus is high, then need further amounts of aerofluxus (accumulated value) that the output of exhaust sensor just can be made to invert.In other words, if
Suck air capacity (flow of time per unit) relatively big, then by the aerofluxus of catalyst-assembly and the exhaust sensor in downstream
Flow velocity increases, and capacity (accumulated value) or suction air capacity (accumulated value) needed for 1 output reversion are the biggest.
In apparatus for diagnosing deterioration in the above prior art, do not account for the impact of above-mentioned flow velocity, it is impossible to carry out suitably
The diagnosis of downstream exhaust sensor.
Patent documentation 1: Japanese Unexamined Patent Publication 11-166438 publication
Summary of the invention
The present invention is the apparatus for diagnosing deterioration of a kind of exhaust sensor, and it is urged being configured in the exhaust channel of internal combustion engine
The deterioration of the exhaust sensor in the downstream of agent device diagnoses, and the apparatus for diagnosing deterioration of this exhaust sensor has: threshold
Value setup unit, it, corresponding to the suction air capacity of internal combustion engine, then sucks air capacity accumulation threshold so that this suction air capacity is the biggest
The biggest characteristic, sets and sucks air capacity accumulation threshold；Setup unit during diagnosis, its from diagnosis start time to suction
Air capacity is accumulated, when this accumulated value reaches above-mentioned suction air capacity accumulation threshold, during terminating diagnosis；And deterioration sentence
Cell, its output reversion number of times based on the above-mentioned exhaust sensor in during this diagnosis, to above-mentioned exhaust sensor
Deterioration judges.
The present invention is substantially based on the invention of following understanding, i.e. in the case of exhaust sensor does not deteriorate, aerofluxus
The output reversion of sensor needs the accumulated value of the suction air capacity of ormal weight (that is, to pass through catalyst-assembly and downstream
The gross exhaust gas of exhaust sensor).Accordingly, as until the accumulated value sucking air capacity reaches the suction air capacity accumulation of regulation
The output reversion number of times of the exhaust sensor in during the diagnosis till threshold value, if exhaust sensor does not deteriorate, then can
Obtain the reversion of stipulated number, but along with exhaust sensor deteriorates, its reversion number of times reduces, and is thus judged to deterioration.
Here, in the present invention, above-mentioned suction air capacity accumulation threshold is corresponding to sucking the air capacity (stream of time per unit
Amount) and set, sucking air capacity is the most greatly that exhaust flow rate is the highest, sucks air capacity accumulation threshold and is set as the biggest.Thus, offset
The impact of above-mentioned exhaust flow rate, it is possible to carry out more appropriate diagnosis.
Apparatus for diagnosing deterioration according to the exhaust sensor that the present invention relates to, it is possible to get rid of by catalyst-assembly and under
The impact of the flow velocity of the aerofluxus of the exhaust sensor of trip, more precisely carries out deterioration diagnosis.
Accompanying drawing explanation
Fig. 1 is the structure explanatory diagram of the internal combustion engine using the apparatus for diagnosing deterioration that the present invention relates to.
Fig. 2 is the flow chart of the handling process representing deterioration diagnosis.
Fig. 3 is to represent the characteristic relative to suction air capacity accumulation threshold WKSTRG sucking air capacity meansigma methods QMav
Performance plot.
Fig. 4 is the sequential chart of the example representing deterioration diagnosis.
Detailed description of the invention
Below, one embodiment of the present of invention is described in detail based on accompanying drawing.
Fig. 1 is shown with the gas handling system of the internal combustion engine of apparatus for diagnosing deterioration and the knot of gas extraction system that the present invention relates to
Structure, using gasoline as in the spark-ignition internal combustion engine i.e. intake channel 2 of internal combustion engine 1 of fuel, be configured with throttler valve 3, and
And, it is configured with at upstream side and will suck the mass air flow sensor 4 that air capacity is such as measured as mass flow.It addition, for
Each cylinder, arranges the Fuelinjection nozzle 5 to tuned port injection fuel.
On the other hand, in the exhaust channel 6 extended to rear vehicle end, in the relatively upstream being equivalent to exhaust manifold collection portion
The 1st catalyst-assembly 7 is installed in the position of side, and, pacify in the position be equivalent under vehicle floor being positioned at downstream in contrast
Fill the 2nd catalyst-assembly 8, and via the deafener 9 in downstream, exhaust channel 6 front end opens to outside.Above-mentioned 1st catalyst
Device 7 and above-mentioned 2nd catalyst-assembly 8 are constituted by three-way catalyst.And, in order to carry out air-fuel ratio feedback control, the 1st
The upstream side of catalyst-assembly 7 arranges upstream side exhaust sensor 10, arranges downstream exhaust sensor 11 in downstream.These
Exhaust sensor 10,11 can be the so-called wide area type air-fuel ratio sensor that can detect air-fuel ratio continuously, it is also possible to be
Can obtain the oxygen sensor (O2 sensor) of the output representing dense, dilute, in the present embodiment, upstream side aerofluxus passes ON/OFF
Sensor 10 is made up of wide area type air-fuel ratio sensor, and downstream exhaust sensor 11 is made up of oxygen sensor.
Detection signal and other not shown sensors of upstream side exhaust sensor 10 and downstream exhaust sensor 11
Together, input is to control unit of engine 12, as shown in known, so that the fuel injection amount of Fuelinjection nozzle 5 chases after for the signal of class
With the mode of target air-fuel ratio (such as chemically correct fuel), carry out feedback control.Namely be based on the inspection of upstream side exhaust sensor 10
Surveying air-fuel ratio, theoretical air-fuel ratio correction coefficient, by being multiplied by this this air fuel ratio correction coefficient, to combustion in substantially fuel emitted dose
Material emitted dose is corrected.The detection signal of downstream exhaust sensor 11 is for entering further above-mentioned air fuel ratio correction coefficient
Row correction.It addition, above-mentioned downstream exhaust sensor 11 can make the response of exporting change drop because of deterioration or heat deterioration
Low, accompany with this, the precise decreasing of air-fuel ration control, therefore, above-mentioned control unit of engine 12 carries out downstream aerofluxus sensing
The diagnosis of the deterioration of device 11.Additionally, control unit of engine 12 the most also carries out the deterioration diagnosis of upstream side exhaust sensor 10,
But this part is not the object of the present invention, and therefore the description thereof will be omitted.
Fig. 2 is the deterioration diagnosis illustrating the downstream exhaust sensor 11 performed by above-mentioned control unit of engine 12
The flow chart of reason flow process.
Program shown in this flow chart, performs, in step 1 repeatedly every predetermined time interval (such as every 10ms)
In, it is determined that whether the conditions for diagnostics that can enter deterioration diagnosis is set up.As this conditions for diagnostics, such as, there are following 3: speed is more than
Or equal to setting (such as 70km/h)；Load change is in prescribed limit；The state meeting above 2 conditions is persistently more than
Or equal to the stipulated time.In the invalid situation of this conditions for diagnostics (or the midway invalid situation of this conditions for diagnostics in diagnosis)
Under, enter step 2, aftermentioned parameter is i.e. sucked air capacity accumulated value QMtotal, sucks air capacity meansigma methods QMav and downstream
The output reversion times N of exhaust sensor 11 initializes respectively, terminates program.
If conditions for diagnostics is set up in step 1, then enter step 3, carry out the fortune of the multiple parameters used in diagnosis
Calculate.1 is the flow to the suction air capacity QM(time per unit detected by mass air flow sensor 4) accumulate, gradually calculate
The total amount of the air capacity from diagnosing and starting i.e. sucks air capacity accumulated value QMtotal.It addition, such as processed by weighted average
Calculate the flow of suction air capacity QM(time per unit detected by mass air flow sensor 4) meansigma methods i.e. to suck air capacity average
Value QMav.And, based on this suction air capacity meansigma methods QMav, such as, utilize prescriber forms, calculate and suck air capacity accumulation
Threshold value WKSTRG.That is, when performing the program of Fig. 2 every time, obtain suction air capacity meansigma methods QMav, suction correspondingly is set
Enter air capacity accumulation threshold WKSTRG.Additionally, this suction air capacity meansigma methods QMav represents after conditions for diagnostics is set up, i.e. diagnoses
Suction air capacity QM that start time rises average.
It addition, in step 3, the output also calculating the downstream exhaust sensor 11 from starting to diagnose inverts times N.
This calculating is such as carried out by following manner, i.e. enter the direction reduced that increases of the output of downstream exhaust sensor 11
Row monitors, when when transferring minimizing to from increase or transferring increase to from minimizing, increases by 1 on N.
Then, enter step 4 from step 3, by the suction of suction air capacity accumulated value QMtotal up to now Yu this moment
Enter air capacity accumulation threshold WKSTRG to compare, it is determined that whether suck air capacity accumulated value QMtotal more than or equal to sucking
Air capacity accumulation threshold WKSTRG.Without reaching to suck air capacity accumulation threshold WKSTRG, then terminate program.Therefore, exist
The period that state that the conditions for diagnostics of step 1 is set up is lasting, step 3, the process of 4 repeatedly, until sucking air capacity accumulated value
QMtotal reaches suction air capacity accumulation threshold WKSTRG corresponding with suction air capacity meansigma methods QMav gradually obtained
Only, the measurement of output reversion times N is persistently carried out.
If sucking air capacity accumulated value QMtotal to be more than or equal to suck air capacity accumulation threshold WKSTRG, then from step
Rapid 4 enter step 5, output up to now inverts times N and compares with reversion frequency threshold value Nmin.If output reversion
Times N more than or equal to reversion frequency threshold value Nmin, then enters step 6, it is determined that normal for downstream exhaust sensor 11.If
Output reversion times N less than reversion frequency threshold value Nmin, then enters step 7, it is determined that for the deterioration of downstream exhaust sensor 11
Deng malfunction.It is of course also possible to be not that the diagnosis with 1 time is finally judged to fault, but the most true with diagnosis repeatedly
It is set to fault.
Fig. 3 represents the spy of suction air capacity accumulation threshold WKSTRG set relative to sucking air capacity meansigma methods QMav
Property.As shown by the solid line in the drawings, suck air capacity meansigma methods QMav the biggest, suck air capacity accumulation threshold WKSTRG and be set to the biggest
Value.This following new opinion based on the present inventor: if as it was previously stated, the suction air capacity of internal combustion engine (time per unit
Flow) big, then by the flow velocity height of catalyst-assembly and the aerofluxus of the exhaust sensor in downstream, the row needed for 1 output reversion
Tolerance accumulated value and suck air capacity accumulated value big, it is illustrated that characteristic slope (i.e. relative to suck air capacity meansigma methods QMav
Increase and suck the increase ratio of air capacity accumulation threshold WKSTRG), be set as offsetting and above-mentioned caused by flow velocity increase
Effect.Here, according to the former understanding of those skilled in the art, as shown in comparative example shown in broken lines, with
Suck air capacity meansigma methods QMav independently from the size, suction air capacity accumulation threshold WKSTRG is set to steady state value.Additionally,
In the example of Fig. 3, become relative to the increase sucking air capacity meansigma methods QMav, suck air capacity accumulation threshold WKSTRG with line
Property, the form that changes the most continuously, but also be able to be set to the increase relative to sucking air capacity meansigma methods QMav, make suction air
Amount accumulation threshold WKSTRG is with stepped change.
Fig. 4 is the sequential chart of the example illustrating deterioration diagnosis, vehicle velocity V SP is shown respectively, sucks air capacity QM, air-fuel
Than feedback control air fuel ratio correction factor alpha, suck air capacity meansigma methods QMav, suck air capacity accumulation threshold WKSTRG and
Suck air capacity accumulated value QMtotal.Additionally, suction air capacity accumulation threshold WKSTRG being compared to each other and suction air capacity are tired out
Product value QMtotal is superposition diagram on same hurdle.
Here, in the example in fig. 4, when the deterioration carrying out downstream exhaust sensor 11 diagnoses, when usual
The air-fuel ratio feedback control of detection air-fuel ratio based on upstream side exhaust sensor 10, switches to based on downstream exhaust sensor
The air-fuel ratio feedback control of the detection air-fuel ratio of 11.Air-fuel ratio in this detection air-fuel ratio based on downstream exhaust sensor 11
In feedback control, the returing cycle of air fuel ratio correction factor alpha, by the shadow of the oxygen storage capacity of the catalyst in the 1st catalyst-assembly 7
Ring, therefore, the air-fuel ratio feedback control of this cycle and the detection air-fuel ratio based on upstream side exhaust sensor 10 when carrying out usual
Returing cycle time processed is compared, relatively long.
In the example of this Fig. 4, being more than or equal to the moment t1 of setting in speed, conditions for diagnostics is set up, as suction
Air capacity accumulated value QMtotal and start to suck the accumulation of air capacity QM.This suction air capacity accumulated value QMtotal is over time
Pass through and be gradually increased.On the other hand, as it has been described above, all calculate suction air capacity meansigma methods QMav when performing program every time,
Correspondingly set suction air capacity accumulation threshold WKSTRG.Additionally, in the diagram, amplify diagram computing in order to illustrate and hold
Between-line spacing.And, in this example embodiment, at moment t2, suck air capacity accumulated value QMtotal and reach to suck air capacity accumulation threshold
WKSTRG, thus terminate during diagnosis.In the diagram, the output of not shown downstream exhaust sensor 11, if but downstream row
Gas sensor 11 not deterioration, then invert in the way of substantially following the conversion of air fuel ratio correction factor alpha, therefore, to from time
Output reversion times N in during carving t1 diagnosis to moment t2 measures, by this measurement result and reversion number of times threshold
Value Nmin compares, thus carries out the diagnosis deteriorated.
Additionally, as air fuel ratio correction factor alpha, (such as can not send out at catalyst in situation about meeting some requirements
Wave the condition etc. of oxygen storage capacity) under, directly use common by detection air-fuel ratio based on upstream side exhaust sensor 10
Air-fuel ratio feedback control and produce the air fuel ratio correction factor alpha of periodic increase and decrease, carry out deterioration diagnosis, or, it is possible to
Temporarily to cancel the air-fuel ratio feedback control of detection air-fuel ratio based on upstream side exhaust sensor 10, in order to carry out diagnosing and strong
Make to property processed air fuel ratio correction factor alpha with the cycle increase and decrease of regulation.
It addition, as reversion frequency threshold value Nmin, can be fixed value, or, it is also possible to it is and engine operating conditions
Or the returing cycle of air fuel ratio correction factor alpha now etc. is corresponding and the value that suitably sets.
As it has been described above, in the above-described embodiments, its result, corresponding to from diagnosis start time t1 to diagnosis finish time t2
Till the average air capacity that sucks of period i.e. suck air capacity meansigma methods QMav, this suction air capacity meansigma methods QMav is the biggest,
Suction air capacity accumulated value QMtotal terminating to diagnosis is the biggest.Air capacity QM(often list is being sucked therefore, it is possible to offset
The flow of bit time) relatively big and by the higher feelings of the flow velocity of the 1st catalyst-assembly 7 or the aerofluxus of downstream exhaust sensor 11
Under condition, the impact on the output reversion of downstream exhaust sensor 11, improves the precision of deterioration diagnosis correspondingly.Especially
Ground, by gradually calculating suction air capacity meansigma methods QMav from diagnosis start time t1, correspondingly gradually sets suction
Enter air capacity accumulation threshold WKSTRG such that it is able to grasp the shadow of suction air capacity QM easily changed at short notice exactly
Ring, and it is directly reflected in diagnosis.Thus, it is not result in that such as diagnosing the required time becomes the frequency that is long and that diagnose
Decline such unfavorable condition.
Claims (4)
1. an apparatus for diagnosing deterioration for exhaust sensor, it is to being configured at catalyst-assembly in the exhaust channel of internal combustion engine
The deterioration of the exhaust sensor in downstream diagnoses,
The apparatus for diagnosing deterioration of this exhaust sensor has:
Setup unit during diagnosis, the suction air capacity of internal combustion engine was accumulated, in this accumulation from diagnosis start time by it
When value reaches to suck air capacity accumulation threshold, during terminating diagnosis, wherein, this suction air capacity represents the stream of time per unit
Amount；
Deterioration judging unit, its output reversion number of times based on the above-mentioned exhaust sensor in during this diagnosis, to above-mentioned row
The deterioration of gas sensor judges；And
Threshold setting unit, it corresponds to described suction air capacity, then sucks air capacity accumulation threshold so that this suction air capacity is the biggest
It is worth the biggest characteristic, sets and suck air capacity accumulation threshold.
The apparatus for diagnosing deterioration of exhaust sensor the most according to claim 1, wherein,
Above-mentioned threshold setting unit, every predetermined time interval, obtains the above-mentioned suction air capacity from diagnosis start time
Meansigma methods, averagely suck air capacity based on this, gradually set and suck air capacity accumulation threshold.
3. a deterioration diagnosis method for exhaust sensor, it is to being configured at catalyst-assembly in the exhaust channel of internal combustion engine
The deterioration of the exhaust sensor in downstream diagnoses,
The deterioration diagnosis method of this exhaust sensor,
Corresponding to the suction air capacity of internal combustion engine, then suck, so that this suction air capacity is the biggest, the spy that air capacity accumulation threshold is the biggest
Property, set and suck air capacity accumulation threshold, wherein, this suction air capacity represents the flow of time per unit；
From diagnosis start time, suction air capacity is accumulated, reach above-mentioned suction air capacity accumulation threshold at this accumulated value
Time, during terminating diagnosis；And
Output reversion number of times based on the above-mentioned exhaust sensor in during this diagnosis, the deterioration to above-mentioned exhaust sensor is entered
Row judges.
The deterioration diagnosis method of exhaust sensor the most according to claim 3, wherein,
The setting of above-mentioned suction air capacity accumulation threshold, is every predetermined time interval, obtains from diagnosis start time
The meansigma methods of above-mentioned suction air capacity, averagely sucks air capacity, gradually sets and suck air capacity accumulation threshold based on this.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-146961 | 2011-07-01 | ||
| JP2011146961 | 2011-07-01 | ||
| PCT/JP2012/065457 WO2013005562A1 (en) | 2011-07-01 | 2012-06-18 | Degradation diagnosis device and degradation diagnosis method for exhaust gas sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103620201A CN103620201A (en) | 2014-03-05 |
| CN103620201B true CN103620201B (en) | 2016-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280031266.1A Active CN103620201B (en) | 2011-07-01 | 2012-06-18 | The apparatus for diagnosing deterioration of exhaust sensor and deterioration diagnosis method |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9404832B2 (en) |
| JP (1) | JP5772956B2 (en) |
| CN (1) | CN103620201B (en) |
| WO (1) | WO2013005562A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9970372B2 (en) * | 2014-02-14 | 2018-05-15 | Ford Global Technologies, Llc | Method of diagnosing an exhaust gas sensor |
| CN105891427B (en) * | 2016-06-08 | 2019-05-31 | 深圳市欧瑞博电子有限公司 | Sensor life-time monitoring method and device based on cloud computing |
| RU2724455C1 (en) * | 2017-06-14 | 2020-06-23 | Мицубиси Электрик Корпорейшн | Diagnostic equipment of deterioration characteristics due to aging and diagnostics method of deterioration due to aging |
| JP6537148B2 (en) * | 2017-08-04 | 2019-07-03 | 株式会社Ｓｕｂａｒｕ | Catalyst abnormality diagnosis device and catalyst abnormality diagnosis method |
| US11813926B2 (en) | 2020-08-20 | 2023-11-14 | Denso International America, Inc. | Binding agent and olfaction sensor |
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| US9404832B2 (en) | 2016-08-02 |
| CN103620201A (en) | 2014-03-05 |
| US20140102166A1 (en) | 2014-04-17 |
| WO2013005562A1 (en) | 2013-01-10 |
| JP5772956B2 (en) | 2015-09-02 |
| JPWO2013005562A1 (en) | 2015-02-23 |
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